1. Doctoral Study, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
2. Department of Clinical Oncology, Regional Specialised Hospital No 4, Bytom, Poland
3. Department of Medical and Molecular Biology, School of Medicine with the Division of Dentistry in Zabrze, Medical University of Silesia, Katowice, Poland
4. Department of Surgery Propedeutics, Chair of General, Colorectal and Trauma Surgery, Medical University of Silesia, Katowice, Poland
5. Department and Clinic of Internal Medicine, School of Public Health in Bytom, Medical University of Silesia, Katowice, Poland
6. Department of Nutrition Related Disease Prevention, Department of Metabolic Disease Prevention, School of Public Health in Bytom, Medical University of Silesia, Katowice, Poland